My girlfriend keeps doing the same old mistakes

Chai knows about a lot of stuff.
You, on the other hand..

You worry about conversations about sex with other guys.

You are likely wrong for each other.

Women get to talk about sex.

okay

I disagree. If she says she's exclusive to you then she needs to show that. This means the "sexting' with her guy friends needs to stop. Mainly because she flaunts her availability - when she claims she is not. And also because it upsets you so.

Perhaps you two need to fire up your relationship. Start sending her hot texts. These should cone from you and you alone IF you are exclusive to each other.